1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * S/390 common I/O routines -- channel subsystem call 4 * 5 * Copyright IBM Corp. 1999,2012 6 * Author(s): Ingo Adlung (adlung@de.ibm.com) 7 * Cornelia Huck (cornelia.huck@de.ibm.com) 8 * Arnd Bergmann (arndb@de.ibm.com) 9 */ 10 11 #define KMSG_COMPONENT "cio" 12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/init.h> 17 #include <linux/device.h> 18 #include <linux/mutex.h> 19 #include <linux/pci.h> 20 21 #include <asm/cio.h> 22 #include <asm/chpid.h> 23 #include <asm/chsc.h> 24 #include <asm/crw.h> 25 #include <asm/isc.h> 26 #include <asm/ebcdic.h> 27 28 #include "css.h" 29 #include "cio.h" 30 #include "cio_debug.h" 31 #include "ioasm.h" 32 #include "chp.h" 33 #include "chsc.h" 34 35 static void *sei_page; 36 static void *chsc_page; 37 static DEFINE_SPINLOCK(chsc_page_lock); 38 39 #define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */ 40 #define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */ 41 42 static BLOCKING_NOTIFIER_HEAD(chsc_notifiers); 43 44 int chsc_notifier_register(struct notifier_block *nb) 45 { 46 return blocking_notifier_chain_register(&chsc_notifiers, nb); 47 } 48 EXPORT_SYMBOL(chsc_notifier_register); 49 50 int chsc_notifier_unregister(struct notifier_block *nb) 51 { 52 return blocking_notifier_chain_unregister(&chsc_notifiers, nb); 53 } 54 EXPORT_SYMBOL(chsc_notifier_unregister); 55 56 /** 57 * chsc_error_from_response() - convert a chsc response to an error 58 * @response: chsc response code 59 * 60 * Returns an appropriate Linux error code for @response. 61 */ 62 int chsc_error_from_response(int response) 63 { 64 switch (response) { 65 case 0x0001: 66 return 0; 67 case 0x0002: 68 case 0x0003: 69 case 0x0006: 70 case 0x0007: 71 case 0x0008: 72 case 0x000a: 73 case 0x0104: 74 return -EINVAL; 75 case 0x0004: 76 case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */ 77 return -EOPNOTSUPP; 78 case 0x000b: 79 case 0x0107: /* "Channel busy" for the op 0x003d */ 80 return -EBUSY; 81 case 0x0100: 82 case 0x0102: 83 return -ENOMEM; 84 case 0x0108: /* "HW limit exceeded" for the op 0x003d */ 85 return -EUSERS; 86 default: 87 return -EIO; 88 } 89 } 90 EXPORT_SYMBOL_GPL(chsc_error_from_response); 91 92 struct chsc_ssd_area { 93 struct chsc_header request; 94 u16 :10; 95 u16 ssid:2; 96 u16 :4; 97 u16 f_sch; /* first subchannel */ 98 u16 :16; 99 u16 l_sch; /* last subchannel */ 100 u32 :32; 101 struct chsc_header response; 102 u32 :32; 103 u8 sch_valid : 1; 104 u8 dev_valid : 1; 105 u8 st : 3; /* subchannel type */ 106 u8 zeroes : 3; 107 u8 unit_addr; /* unit address */ 108 u16 devno; /* device number */ 109 u8 path_mask; 110 u8 fla_valid_mask; 111 u16 sch; /* subchannel */ 112 u8 chpid[8]; /* chpids 0-7 */ 113 u16 fla[8]; /* full link addresses 0-7 */ 114 } __packed __aligned(PAGE_SIZE); 115 116 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd) 117 { 118 struct chsc_ssd_area *ssd_area; 119 unsigned long flags; 120 int ccode; 121 int ret; 122 int i; 123 int mask; 124 125 spin_lock_irqsave(&chsc_page_lock, flags); 126 memset(chsc_page, 0, PAGE_SIZE); 127 ssd_area = chsc_page; 128 ssd_area->request.length = 0x0010; 129 ssd_area->request.code = 0x0004; 130 ssd_area->ssid = schid.ssid; 131 ssd_area->f_sch = schid.sch_no; 132 ssd_area->l_sch = schid.sch_no; 133 134 ccode = chsc(ssd_area); 135 /* Check response. */ 136 if (ccode > 0) { 137 ret = (ccode == 3) ? -ENODEV : -EBUSY; 138 goto out; 139 } 140 ret = chsc_error_from_response(ssd_area->response.code); 141 if (ret != 0) { 142 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n", 143 schid.ssid, schid.sch_no, 144 ssd_area->response.code); 145 goto out; 146 } 147 if (!ssd_area->sch_valid) { 148 ret = -ENODEV; 149 goto out; 150 } 151 /* Copy data */ 152 ret = 0; 153 memset(ssd, 0, sizeof(struct chsc_ssd_info)); 154 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) && 155 (ssd_area->st != SUBCHANNEL_TYPE_MSG)) 156 goto out; 157 ssd->path_mask = ssd_area->path_mask; 158 ssd->fla_valid_mask = ssd_area->fla_valid_mask; 159 for (i = 0; i < 8; i++) { 160 mask = 0x80 >> i; 161 if (ssd_area->path_mask & mask) { 162 chp_id_init(&ssd->chpid[i]); 163 ssd->chpid[i].id = ssd_area->chpid[i]; 164 } 165 if (ssd_area->fla_valid_mask & mask) 166 ssd->fla[i] = ssd_area->fla[i]; 167 } 168 out: 169 spin_unlock_irqrestore(&chsc_page_lock, flags); 170 return ret; 171 } 172 173 /** 174 * chsc_ssqd() - store subchannel QDIO data (SSQD) 175 * @schid: id of the subchannel on which SSQD is performed 176 * @ssqd: request and response block for SSQD 177 * 178 * Returns 0 on success. 179 */ 180 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd) 181 { 182 memset(ssqd, 0, sizeof(*ssqd)); 183 ssqd->request.length = 0x0010; 184 ssqd->request.code = 0x0024; 185 ssqd->first_sch = schid.sch_no; 186 ssqd->last_sch = schid.sch_no; 187 ssqd->ssid = schid.ssid; 188 189 if (chsc(ssqd)) 190 return -EIO; 191 192 return chsc_error_from_response(ssqd->response.code); 193 } 194 EXPORT_SYMBOL_GPL(chsc_ssqd); 195 196 /** 197 * chsc_sadc() - set adapter device controls (SADC) 198 * @schid: id of the subchannel on which SADC is performed 199 * @scssc: request and response block for SADC 200 * @summary_indicator_addr: summary indicator address 201 * @subchannel_indicator_addr: subchannel indicator address 202 * @isc: Interruption Subclass for this subchannel 203 * 204 * Returns 0 on success. 205 */ 206 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc, 207 dma64_t summary_indicator_addr, dma64_t subchannel_indicator_addr, u8 isc) 208 { 209 memset(scssc, 0, sizeof(*scssc)); 210 scssc->request.length = 0x0fe0; 211 scssc->request.code = 0x0021; 212 scssc->operation_code = 0; 213 214 scssc->summary_indicator_addr = summary_indicator_addr; 215 scssc->subchannel_indicator_addr = subchannel_indicator_addr; 216 217 scssc->ks = PAGE_DEFAULT_KEY >> 4; 218 scssc->kc = PAGE_DEFAULT_KEY >> 4; 219 scssc->isc = isc; 220 scssc->schid = schid; 221 222 /* enable the time delay disablement facility */ 223 if (css_general_characteristics.aif_tdd) 224 scssc->word_with_d_bit = 0x10000000; 225 226 if (chsc(scssc)) 227 return -EIO; 228 229 return chsc_error_from_response(scssc->response.code); 230 } 231 EXPORT_SYMBOL_GPL(chsc_sadc); 232 233 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) 234 { 235 spin_lock_irq(&sch->lock); 236 if (sch->driver && sch->driver->chp_event) 237 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) 238 goto out_unreg; 239 spin_unlock_irq(&sch->lock); 240 return 0; 241 242 out_unreg: 243 sch->lpm = 0; 244 spin_unlock_irq(&sch->lock); 245 css_schedule_eval(sch->schid); 246 return 0; 247 } 248 249 void chsc_chp_offline(struct chp_id chpid) 250 { 251 struct channel_path *chp = chpid_to_chp(chpid); 252 struct chp_link link; 253 char dbf_txt[15]; 254 255 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); 256 CIO_TRACE_EVENT(2, dbf_txt); 257 258 if (chp_get_status(chpid) <= 0) 259 return; 260 memset(&link, 0, sizeof(struct chp_link)); 261 link.chpid = chpid; 262 /* Wait until previous actions have settled. */ 263 css_wait_for_slow_path(); 264 265 mutex_lock(&chp->lock); 266 chp_update_desc(chp); 267 mutex_unlock(&chp->lock); 268 269 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link); 270 } 271 272 static int __s390_process_res_acc(struct subchannel *sch, void *data) 273 { 274 spin_lock_irq(&sch->lock); 275 if (sch->driver && sch->driver->chp_event) 276 sch->driver->chp_event(sch, data, CHP_ONLINE); 277 spin_unlock_irq(&sch->lock); 278 279 return 0; 280 } 281 282 static void s390_process_res_acc(struct chp_link *link) 283 { 284 char dbf_txt[15]; 285 286 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid, 287 link->chpid.id); 288 CIO_TRACE_EVENT( 2, dbf_txt); 289 if (link->fla != 0) { 290 sprintf(dbf_txt, "fla%x", link->fla); 291 CIO_TRACE_EVENT( 2, dbf_txt); 292 } 293 /* Wait until previous actions have settled. */ 294 css_wait_for_slow_path(); 295 /* 296 * I/O resources may have become accessible. 297 * Scan through all subchannels that may be concerned and 298 * do a validation on those. 299 * The more information we have (info), the less scanning 300 * will we have to do. 301 */ 302 for_each_subchannel_staged(__s390_process_res_acc, NULL, link); 303 css_schedule_reprobe(); 304 } 305 306 static int process_fces_event(struct subchannel *sch, void *data) 307 { 308 spin_lock_irq(&sch->lock); 309 if (sch->driver && sch->driver->chp_event) 310 sch->driver->chp_event(sch, data, CHP_FCES_EVENT); 311 spin_unlock_irq(&sch->lock); 312 return 0; 313 } 314 315 struct chsc_sei_nt0_area { 316 u8 flags; 317 u8 vf; /* validity flags */ 318 u8 rs; /* reporting source */ 319 u8 cc; /* content code */ 320 u16 fla; /* full link address */ 321 u16 rsid; /* reporting source id */ 322 u32 reserved1; 323 u32 reserved2; 324 /* ccdf has to be big enough for a link-incident record */ 325 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */ 326 } __packed; 327 328 struct chsc_sei_nt2_area { 329 u8 flags; /* p and v bit */ 330 u8 reserved1; 331 u8 reserved2; 332 u8 cc; /* content code */ 333 u32 reserved3[13]; 334 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */ 335 } __packed; 336 337 #define CHSC_SEI_NT0 (1ULL << 63) 338 #define CHSC_SEI_NT2 (1ULL << 61) 339 340 struct chsc_sei { 341 struct chsc_header request; 342 u32 reserved1; 343 u64 ntsm; /* notification type mask */ 344 struct chsc_header response; 345 u32 :24; 346 u8 nt; 347 union { 348 struct chsc_sei_nt0_area nt0_area; 349 struct chsc_sei_nt2_area nt2_area; 350 u8 nt_area[PAGE_SIZE - 24]; 351 } u; 352 } __packed __aligned(PAGE_SIZE); 353 354 /* 355 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface" 356 */ 357 358 #define LIR_IQ_CLASS_INFO 0 359 #define LIR_IQ_CLASS_DEGRADED 1 360 #define LIR_IQ_CLASS_NOT_OPERATIONAL 2 361 362 struct lir { 363 struct { 364 u32 null:1; 365 u32 reserved:3; 366 u32 class:2; 367 u32 reserved2:2; 368 } __packed iq; 369 u32 ic:8; 370 u32 reserved:16; 371 struct node_descriptor incident_node; 372 struct node_descriptor attached_node; 373 u8 reserved2[32]; 374 } __packed; 375 376 #define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */ 377 #define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ 378 379 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */ 380 static char *store_ebcdic(char *dest, const char *src, unsigned long len, 381 char delim) 382 { 383 memcpy(dest, src, len); 384 EBCASC(dest, len); 385 386 if (delim) 387 dest[len++] = delim; 388 389 return dest + len; 390 } 391 392 static void chsc_link_from_sei(struct chp_link *link, 393 struct chsc_sei_nt0_area *sei_area) 394 { 395 if ((sei_area->vf & SEI_VF_FLA) != 0) { 396 link->fla = sei_area->fla; 397 link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ? 398 0xffff : 0xff00; 399 } 400 } 401 402 /* Format node ID and parameters for output in LIR log message. */ 403 static void format_node_data(char *params, char *id, struct node_descriptor *nd) 404 { 405 memset(params, 0, PARAMS_LEN); 406 memset(id, 0, NODEID_LEN); 407 408 if (nd->validity != ND_VALIDITY_VALID) { 409 strscpy(params, "n/a", PARAMS_LEN); 410 strscpy(id, "n/a", NODEID_LEN); 411 return; 412 } 413 414 /* PARAMS=xx,xxxxxx */ 415 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params); 416 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ 417 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/'); 418 id = store_ebcdic(id, nd->model, sizeof(nd->model), ','); 419 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.'); 420 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0); 421 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ','); 422 sprintf(id, "%04X", nd->tag); 423 } 424 425 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area) 426 { 427 struct lir *lir = (struct lir *) &sei_area->ccdf; 428 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN], 429 aunodeid[NODEID_LEN]; 430 431 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n", 432 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); 433 434 /* Ignore NULL Link Incident Records. */ 435 if (lir->iq.null) 436 return; 437 438 /* Inform user that a link requires maintenance actions because it has 439 * become degraded or not operational. Note that this log message is 440 * the primary intention behind a Link Incident Record. */ 441 442 format_node_data(iuparams, iunodeid, &lir->incident_node); 443 format_node_data(auparams, aunodeid, &lir->attached_node); 444 445 switch (lir->iq.class) { 446 case LIR_IQ_CLASS_DEGRADED: 447 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x " 448 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 449 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 450 iunodeid, auparams, aunodeid); 451 break; 452 case LIR_IQ_CLASS_NOT_OPERATIONAL: 453 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x " 454 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 455 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 456 iunodeid, auparams, aunodeid); 457 break; 458 default: 459 break; 460 } 461 } 462 463 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) 464 { 465 struct channel_path *chp; 466 struct chp_link link; 467 struct chp_id chpid; 468 int status; 469 470 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " 471 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); 472 if (sei_area->rs != 4) 473 return; 474 chp_id_init(&chpid); 475 chpid.id = sei_area->rsid; 476 /* allocate a new channel path structure, if needed */ 477 status = chp_get_status(chpid); 478 if (!status) 479 return; 480 481 if (status < 0) { 482 chp_new(chpid); 483 } else { 484 chp = chpid_to_chp(chpid); 485 mutex_lock(&chp->lock); 486 chp_update_desc(chp); 487 mutex_unlock(&chp->lock); 488 } 489 memset(&link, 0, sizeof(struct chp_link)); 490 link.chpid = chpid; 491 chsc_link_from_sei(&link, sei_area); 492 s390_process_res_acc(&link); 493 } 494 495 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area) 496 { 497 struct channel_path *chp; 498 struct chp_id chpid; 499 u8 *data; 500 int num; 501 502 CIO_CRW_EVENT(4, "chsc: channel path availability information\n"); 503 if (sei_area->rs != 0) 504 return; 505 data = sei_area->ccdf; 506 chp_id_init(&chpid); 507 for (num = 0; num <= __MAX_CHPID; num++) { 508 if (!chp_test_bit(data, num)) 509 continue; 510 chpid.id = num; 511 512 CIO_CRW_EVENT(4, "Update information for channel path " 513 "%x.%02x\n", chpid.cssid, chpid.id); 514 chp = chpid_to_chp(chpid); 515 if (!chp) { 516 chp_new(chpid); 517 continue; 518 } 519 mutex_lock(&chp->lock); 520 chp_update_desc(chp); 521 mutex_unlock(&chp->lock); 522 } 523 } 524 525 struct chp_config_data { 526 u8 map[32]; 527 u8 op; 528 u8 pc; 529 }; 530 531 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area) 532 { 533 struct chp_config_data *data; 534 struct chp_id chpid; 535 int num; 536 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"}; 537 538 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n"); 539 if (sei_area->rs != 0) 540 return; 541 data = (struct chp_config_data *) &(sei_area->ccdf); 542 chp_id_init(&chpid); 543 for (num = 0; num <= __MAX_CHPID; num++) { 544 if (!chp_test_bit(data->map, num)) 545 continue; 546 chpid.id = num; 547 pr_notice("Processing %s for channel path %x.%02x\n", 548 events[data->op], chpid.cssid, chpid.id); 549 switch (data->op) { 550 case 0: 551 chp_cfg_schedule(chpid, 1); 552 break; 553 case 1: 554 chp_cfg_schedule(chpid, 0); 555 break; 556 case 2: 557 chp_cfg_cancel_deconfigure(chpid); 558 break; 559 } 560 } 561 } 562 563 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area) 564 { 565 int ret; 566 567 CIO_CRW_EVENT(4, "chsc: scm change notification\n"); 568 if (sei_area->rs != 7) 569 return; 570 571 ret = scm_update_information(); 572 if (ret) 573 CIO_CRW_EVENT(0, "chsc: updating change notification" 574 " failed (rc=%d).\n", ret); 575 } 576 577 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area) 578 { 579 int ret; 580 581 CIO_CRW_EVENT(4, "chsc: scm available information\n"); 582 if (sei_area->rs != 7) 583 return; 584 585 ret = scm_process_availability_information(); 586 if (ret) 587 CIO_CRW_EVENT(0, "chsc: process availability information" 588 " failed (rc=%d).\n", ret); 589 } 590 591 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area) 592 { 593 CIO_CRW_EVENT(3, "chsc: ap config changed\n"); 594 if (sei_area->rs != 5) 595 return; 596 597 blocking_notifier_call_chain(&chsc_notifiers, 598 CHSC_NOTIFY_AP_CFG, NULL); 599 } 600 601 static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area) 602 { 603 struct chp_link link; 604 struct chp_id chpid; 605 struct channel_path *chp; 606 607 CIO_CRW_EVENT(4, 608 "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n", 609 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); 610 611 if (sei_area->rs != SEI_RS_CHPID) 612 return; 613 chp_id_init(&chpid); 614 chpid.id = sei_area->rsid; 615 616 /* Ignore the event on unknown/invalid chp */ 617 chp = chpid_to_chp(chpid); 618 if (!chp) 619 return; 620 621 memset(&link, 0, sizeof(struct chp_link)); 622 link.chpid = chpid; 623 chsc_link_from_sei(&link, sei_area); 624 625 for_each_subchannel_staged(process_fces_event, NULL, &link); 626 } 627 628 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area) 629 { 630 switch (sei_area->cc) { 631 case 1: 632 zpci_event_error(sei_area->ccdf); 633 break; 634 case 2: 635 zpci_event_availability(sei_area->ccdf); 636 break; 637 default: 638 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n", 639 sei_area->cc); 640 break; 641 } 642 } 643 644 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) 645 { 646 /* which kind of information was stored? */ 647 switch (sei_area->cc) { 648 case 1: /* link incident*/ 649 chsc_process_sei_link_incident(sei_area); 650 break; 651 case 2: /* i/o resource accessibility */ 652 chsc_process_sei_res_acc(sei_area); 653 break; 654 case 3: /* ap config changed */ 655 chsc_process_sei_ap_cfg_chg(sei_area); 656 break; 657 case 7: /* channel-path-availability information */ 658 chsc_process_sei_chp_avail(sei_area); 659 break; 660 case 8: /* channel-path-configuration notification */ 661 chsc_process_sei_chp_config(sei_area); 662 break; 663 case 12: /* scm change notification */ 664 chsc_process_sei_scm_change(sei_area); 665 break; 666 case 14: /* scm available notification */ 667 chsc_process_sei_scm_avail(sei_area); 668 break; 669 case 15: /* FCES event notification */ 670 chsc_process_sei_fces_event(sei_area); 671 break; 672 default: /* other stuff */ 673 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n", 674 sei_area->cc); 675 break; 676 } 677 678 /* Check if we might have lost some information. */ 679 if (sei_area->flags & 0x40) { 680 CIO_CRW_EVENT(2, "chsc: event overflow\n"); 681 css_schedule_eval_all(); 682 } 683 } 684 685 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm) 686 { 687 static int ntsm_unsupported; 688 689 while (true) { 690 memset(sei, 0, sizeof(*sei)); 691 sei->request.length = 0x0010; 692 sei->request.code = 0x000e; 693 if (!ntsm_unsupported) 694 sei->ntsm = ntsm; 695 696 if (chsc(sei)) 697 break; 698 699 if (sei->response.code != 0x0001) { 700 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n", 701 sei->response.code, sei->ntsm); 702 703 if (sei->response.code == 3 && sei->ntsm) { 704 /* Fallback for old firmware. */ 705 ntsm_unsupported = 1; 706 continue; 707 } 708 break; 709 } 710 711 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt); 712 switch (sei->nt) { 713 case 0: 714 chsc_process_sei_nt0(&sei->u.nt0_area); 715 break; 716 case 2: 717 chsc_process_sei_nt2(&sei->u.nt2_area); 718 break; 719 default: 720 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt); 721 break; 722 } 723 724 if (!(sei->u.nt0_area.flags & 0x80)) 725 break; 726 } 727 } 728 729 /* 730 * Handle channel subsystem related CRWs. 731 * Use store event information to find out what's going on. 732 * 733 * Note: Access to sei_page is serialized through machine check handler 734 * thread, so no need for locking. 735 */ 736 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) 737 { 738 struct chsc_sei *sei = sei_page; 739 740 if (overflow) { 741 css_schedule_eval_all(); 742 return; 743 } 744 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 745 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 746 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 747 crw0->erc, crw0->rsid); 748 749 CIO_TRACE_EVENT(2, "prcss"); 750 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2); 751 } 752 753 void chsc_chp_online(struct chp_id chpid) 754 { 755 struct channel_path *chp = chpid_to_chp(chpid); 756 struct chp_link link; 757 char dbf_txt[15]; 758 759 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); 760 CIO_TRACE_EVENT(2, dbf_txt); 761 762 if (chp_get_status(chpid) != 0) { 763 memset(&link, 0, sizeof(struct chp_link)); 764 link.chpid = chpid; 765 /* Wait until previous actions have settled. */ 766 css_wait_for_slow_path(); 767 768 mutex_lock(&chp->lock); 769 chp_update_desc(chp); 770 mutex_unlock(&chp->lock); 771 772 for_each_subchannel_staged(__s390_process_res_acc, NULL, 773 &link); 774 css_schedule_reprobe(); 775 } 776 } 777 778 static void __s390_subchannel_vary_chpid(struct subchannel *sch, 779 struct chp_id chpid, int on) 780 { 781 unsigned long flags; 782 struct chp_link link; 783 784 memset(&link, 0, sizeof(struct chp_link)); 785 link.chpid = chpid; 786 spin_lock_irqsave(&sch->lock, flags); 787 if (sch->driver && sch->driver->chp_event) 788 sch->driver->chp_event(sch, &link, 789 on ? CHP_VARY_ON : CHP_VARY_OFF); 790 spin_unlock_irqrestore(&sch->lock, flags); 791 } 792 793 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data) 794 { 795 struct chp_id *chpid = data; 796 797 __s390_subchannel_vary_chpid(sch, *chpid, 0); 798 return 0; 799 } 800 801 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data) 802 { 803 struct chp_id *chpid = data; 804 805 __s390_subchannel_vary_chpid(sch, *chpid, 1); 806 return 0; 807 } 808 809 /** 810 * chsc_chp_vary - propagate channel-path vary operation to subchannels 811 * @chpid: channl-path ID 812 * @on: non-zero for vary online, zero for vary offline 813 */ 814 int chsc_chp_vary(struct chp_id chpid, int on) 815 { 816 struct channel_path *chp = chpid_to_chp(chpid); 817 818 /* 819 * Redo PathVerification on the devices the chpid connects to 820 */ 821 if (on) { 822 /* Try to update the channel path description. */ 823 chp_update_desc(chp); 824 for_each_subchannel_staged(s390_subchannel_vary_chpid_on, 825 NULL, &chpid); 826 css_schedule_reprobe(); 827 } else 828 for_each_subchannel_staged(s390_subchannel_vary_chpid_off, 829 NULL, &chpid); 830 831 return 0; 832 } 833 834 static void 835 chsc_remove_cmg_attr(struct channel_subsystem *css) 836 { 837 int i; 838 839 for (i = 0; i <= __MAX_CHPID; i++) { 840 if (!css->chps[i]) 841 continue; 842 chp_remove_cmg_attr(css->chps[i]); 843 } 844 } 845 846 static int 847 chsc_add_cmg_attr(struct channel_subsystem *css) 848 { 849 int i, ret; 850 851 ret = 0; 852 for (i = 0; i <= __MAX_CHPID; i++) { 853 if (!css->chps[i]) 854 continue; 855 ret = chp_add_cmg_attr(css->chps[i]); 856 if (ret) 857 goto cleanup; 858 } 859 return ret; 860 cleanup: 861 while (i--) { 862 if (!css->chps[i]) 863 continue; 864 chp_remove_cmg_attr(css->chps[i]); 865 } 866 return ret; 867 } 868 869 int __chsc_do_secm(struct channel_subsystem *css, int enable) 870 { 871 struct { 872 struct chsc_header request; 873 u32 operation_code : 2; 874 u32 : 30; 875 u32 key : 4; 876 u32 : 28; 877 u32 zeroes1; 878 dma32_t cub_addr1; 879 u32 zeroes2; 880 dma32_t cub_addr2; 881 u32 reserved[13]; 882 struct chsc_header response; 883 u32 status : 8; 884 u32 : 4; 885 u32 fmt : 4; 886 u32 : 16; 887 } *secm_area; 888 unsigned long flags; 889 int ret, ccode; 890 891 spin_lock_irqsave(&chsc_page_lock, flags); 892 memset(chsc_page, 0, PAGE_SIZE); 893 secm_area = chsc_page; 894 secm_area->request.length = 0x0050; 895 secm_area->request.code = 0x0016; 896 897 secm_area->key = PAGE_DEFAULT_KEY >> 4; 898 secm_area->cub_addr1 = virt_to_dma32(css->cub_addr1); 899 secm_area->cub_addr2 = virt_to_dma32(css->cub_addr2); 900 901 secm_area->operation_code = enable ? 0 : 1; 902 903 ccode = chsc(secm_area); 904 if (ccode > 0) { 905 ret = (ccode == 3) ? -ENODEV : -EBUSY; 906 goto out; 907 } 908 909 switch (secm_area->response.code) { 910 case 0x0102: 911 case 0x0103: 912 ret = -EINVAL; 913 break; 914 default: 915 ret = chsc_error_from_response(secm_area->response.code); 916 } 917 if (ret != 0) 918 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n", 919 secm_area->response.code); 920 out: 921 spin_unlock_irqrestore(&chsc_page_lock, flags); 922 return ret; 923 } 924 925 int 926 chsc_secm(struct channel_subsystem *css, int enable) 927 { 928 int ret; 929 930 if (enable && !css->cm_enabled) { 931 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 932 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 933 if (!css->cub_addr1 || !css->cub_addr2) { 934 free_page((unsigned long)css->cub_addr1); 935 free_page((unsigned long)css->cub_addr2); 936 return -ENOMEM; 937 } 938 } 939 ret = __chsc_do_secm(css, enable); 940 if (!ret) { 941 css->cm_enabled = enable; 942 if (css->cm_enabled) { 943 ret = chsc_add_cmg_attr(css); 944 if (ret) { 945 __chsc_do_secm(css, 0); 946 css->cm_enabled = 0; 947 } 948 } else 949 chsc_remove_cmg_attr(css); 950 } 951 if (!css->cm_enabled) { 952 free_page((unsigned long)css->cub_addr1); 953 free_page((unsigned long)css->cub_addr2); 954 } 955 return ret; 956 } 957 958 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, 959 int c, int m, void *page) 960 { 961 struct chsc_scpd *scpd_area; 962 int ccode, ret; 963 964 if ((rfmt == 1 || rfmt == 0) && c == 1 && 965 !css_general_characteristics.fcs) 966 return -EINVAL; 967 if ((rfmt == 2) && !css_general_characteristics.cib) 968 return -EINVAL; 969 if ((rfmt == 3) && !css_general_characteristics.util_str) 970 return -EINVAL; 971 972 memset(page, 0, PAGE_SIZE); 973 scpd_area = page; 974 scpd_area->request.length = 0x0010; 975 scpd_area->request.code = 0x0002; 976 scpd_area->cssid = chpid.cssid; 977 scpd_area->first_chpid = chpid.id; 978 scpd_area->last_chpid = chpid.id; 979 scpd_area->m = m; 980 scpd_area->c = c; 981 scpd_area->fmt = fmt; 982 scpd_area->rfmt = rfmt; 983 984 ccode = chsc(scpd_area); 985 if (ccode > 0) 986 return (ccode == 3) ? -ENODEV : -EBUSY; 987 988 ret = chsc_error_from_response(scpd_area->response.code); 989 if (ret) 990 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", 991 scpd_area->response.code); 992 return ret; 993 } 994 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); 995 996 #define chsc_det_chp_desc(FMT, c) \ 997 int chsc_determine_fmt##FMT##_channel_path_desc( \ 998 struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \ 999 { \ 1000 struct chsc_scpd *scpd_area; \ 1001 unsigned long flags; \ 1002 int ret; \ 1003 \ 1004 spin_lock_irqsave(&chsc_page_lock, flags); \ 1005 scpd_area = chsc_page; \ 1006 ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \ 1007 scpd_area); \ 1008 if (ret) \ 1009 goto out; \ 1010 \ 1011 memcpy(desc, scpd_area->data, sizeof(*desc)); \ 1012 out: \ 1013 spin_unlock_irqrestore(&chsc_page_lock, flags); \ 1014 return ret; \ 1015 } 1016 1017 chsc_det_chp_desc(0, 0) 1018 chsc_det_chp_desc(1, 1) 1019 chsc_det_chp_desc(3, 0) 1020 1021 static void 1022 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, 1023 struct cmg_chars *chars) 1024 { 1025 int i, mask; 1026 1027 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { 1028 mask = 0x80 >> (i + 3); 1029 if (cmcv & mask) 1030 chp->cmg_chars.values[i] = chars->values[i]; 1031 else 1032 chp->cmg_chars.values[i] = 0; 1033 } 1034 } 1035 1036 int chsc_get_channel_measurement_chars(struct channel_path *chp) 1037 { 1038 unsigned long flags; 1039 int ccode, ret; 1040 1041 struct { 1042 struct chsc_header request; 1043 u32 : 24; 1044 u32 first_chpid : 8; 1045 u32 : 24; 1046 u32 last_chpid : 8; 1047 u32 zeroes1; 1048 struct chsc_header response; 1049 u32 zeroes2; 1050 u32 not_valid : 1; 1051 u32 shared : 1; 1052 u32 : 22; 1053 u32 chpid : 8; 1054 u32 cmcv : 5; 1055 u32 : 11; 1056 u32 cmgq : 8; 1057 u32 cmg : 8; 1058 u32 zeroes3; 1059 u32 data[NR_MEASUREMENT_CHARS]; 1060 } *scmc_area; 1061 1062 chp->shared = -1; 1063 chp->cmg = -1; 1064 1065 if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) 1066 return -EINVAL; 1067 1068 spin_lock_irqsave(&chsc_page_lock, flags); 1069 memset(chsc_page, 0, PAGE_SIZE); 1070 scmc_area = chsc_page; 1071 scmc_area->request.length = 0x0010; 1072 scmc_area->request.code = 0x0022; 1073 scmc_area->first_chpid = chp->chpid.id; 1074 scmc_area->last_chpid = chp->chpid.id; 1075 1076 ccode = chsc(scmc_area); 1077 if (ccode > 0) { 1078 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1079 goto out; 1080 } 1081 1082 ret = chsc_error_from_response(scmc_area->response.code); 1083 if (ret) { 1084 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n", 1085 scmc_area->response.code); 1086 goto out; 1087 } 1088 if (scmc_area->not_valid) 1089 goto out; 1090 1091 chp->cmg = scmc_area->cmg; 1092 chp->shared = scmc_area->shared; 1093 if (chp->cmg != 2 && chp->cmg != 3) { 1094 /* No cmg-dependent data. */ 1095 goto out; 1096 } 1097 chsc_initialize_cmg_chars(chp, scmc_area->cmcv, 1098 (struct cmg_chars *) &scmc_area->data); 1099 out: 1100 spin_unlock_irqrestore(&chsc_page_lock, flags); 1101 return ret; 1102 } 1103 1104 int __init chsc_init(void) 1105 { 1106 int ret; 1107 1108 sei_page = (void *)get_zeroed_page(GFP_KERNEL); 1109 chsc_page = (void *)get_zeroed_page(GFP_KERNEL); 1110 if (!sei_page || !chsc_page) { 1111 ret = -ENOMEM; 1112 goto out_err; 1113 } 1114 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); 1115 if (ret) 1116 goto out_err; 1117 return ret; 1118 out_err: 1119 free_page((unsigned long)chsc_page); 1120 free_page((unsigned long)sei_page); 1121 return ret; 1122 } 1123 1124 void __init chsc_init_cleanup(void) 1125 { 1126 crw_unregister_handler(CRW_RSC_CSS); 1127 free_page((unsigned long)chsc_page); 1128 free_page((unsigned long)sei_page); 1129 } 1130 1131 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code) 1132 { 1133 int ret; 1134 1135 sda_area->request.length = 0x0400; 1136 sda_area->request.code = 0x0031; 1137 sda_area->operation_code = operation_code; 1138 1139 ret = chsc(sda_area); 1140 if (ret > 0) { 1141 ret = (ret == 3) ? -ENODEV : -EBUSY; 1142 goto out; 1143 } 1144 1145 switch (sda_area->response.code) { 1146 case 0x0101: 1147 ret = -EOPNOTSUPP; 1148 break; 1149 default: 1150 ret = chsc_error_from_response(sda_area->response.code); 1151 } 1152 out: 1153 return ret; 1154 } 1155 1156 int chsc_enable_facility(int operation_code) 1157 { 1158 struct chsc_sda_area *sda_area; 1159 unsigned long flags; 1160 int ret; 1161 1162 spin_lock_irqsave(&chsc_page_lock, flags); 1163 memset(chsc_page, 0, PAGE_SIZE); 1164 sda_area = chsc_page; 1165 1166 ret = __chsc_enable_facility(sda_area, operation_code); 1167 if (ret != 0) 1168 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n", 1169 operation_code, sda_area->response.code); 1170 1171 spin_unlock_irqrestore(&chsc_page_lock, flags); 1172 return ret; 1173 } 1174 1175 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid) 1176 { 1177 struct { 1178 struct chsc_header request; 1179 u8 atype; 1180 u32 : 24; 1181 u32 reserved1[6]; 1182 struct chsc_header response; 1183 u32 reserved2[3]; 1184 struct { 1185 u8 cssid; 1186 u8 iid; 1187 u32 : 16; 1188 } list[]; 1189 } *sdcal_area; 1190 int ret; 1191 1192 spin_lock_irq(&chsc_page_lock); 1193 memset(chsc_page, 0, PAGE_SIZE); 1194 sdcal_area = chsc_page; 1195 sdcal_area->request.length = 0x0020; 1196 sdcal_area->request.code = 0x0034; 1197 sdcal_area->atype = 4; 1198 1199 ret = chsc(sdcal_area); 1200 if (ret) { 1201 ret = (ret == 3) ? -ENODEV : -EBUSY; 1202 goto exit; 1203 } 1204 1205 ret = chsc_error_from_response(sdcal_area->response.code); 1206 if (ret) { 1207 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n", 1208 sdcal_area->response.code); 1209 goto exit; 1210 } 1211 1212 if ((addr_t) &sdcal_area->list[idx] < 1213 (addr_t) &sdcal_area->response + sdcal_area->response.length) { 1214 *cssid = sdcal_area->list[idx].cssid; 1215 *iid = sdcal_area->list[idx].iid; 1216 } 1217 else 1218 ret = -ENODEV; 1219 exit: 1220 spin_unlock_irq(&chsc_page_lock); 1221 return ret; 1222 } 1223 1224 struct css_general_char css_general_characteristics; 1225 struct css_chsc_char css_chsc_characteristics; 1226 1227 int __init 1228 chsc_determine_css_characteristics(void) 1229 { 1230 unsigned long flags; 1231 int result; 1232 struct { 1233 struct chsc_header request; 1234 u32 reserved1; 1235 u32 reserved2; 1236 u32 reserved3; 1237 struct chsc_header response; 1238 u32 reserved4; 1239 u32 general_char[510]; 1240 u32 chsc_char[508]; 1241 } *scsc_area; 1242 1243 spin_lock_irqsave(&chsc_page_lock, flags); 1244 memset(chsc_page, 0, PAGE_SIZE); 1245 scsc_area = chsc_page; 1246 scsc_area->request.length = 0x0010; 1247 scsc_area->request.code = 0x0010; 1248 1249 result = chsc(scsc_area); 1250 if (result) { 1251 result = (result == 3) ? -ENODEV : -EBUSY; 1252 goto exit; 1253 } 1254 1255 result = chsc_error_from_response(scsc_area->response.code); 1256 if (result == 0) { 1257 memcpy(&css_general_characteristics, scsc_area->general_char, 1258 sizeof(css_general_characteristics)); 1259 memcpy(&css_chsc_characteristics, scsc_area->chsc_char, 1260 sizeof(css_chsc_characteristics)); 1261 } else 1262 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n", 1263 scsc_area->response.code); 1264 exit: 1265 spin_unlock_irqrestore(&chsc_page_lock, flags); 1266 return result; 1267 } 1268 1269 EXPORT_SYMBOL_GPL(css_general_characteristics); 1270 EXPORT_SYMBOL_GPL(css_chsc_characteristics); 1271 1272 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta) 1273 { 1274 struct { 1275 struct chsc_header request; 1276 unsigned int rsvd0; 1277 unsigned int op : 8; 1278 unsigned int rsvd1 : 8; 1279 unsigned int ctrl : 16; 1280 unsigned int rsvd2[5]; 1281 struct chsc_header response; 1282 unsigned int rsvd3[3]; 1283 s64 clock_delta; 1284 unsigned int rsvd4[2]; 1285 } *rr; 1286 int rc; 1287 1288 memset(page, 0, PAGE_SIZE); 1289 rr = page; 1290 rr->request.length = 0x0020; 1291 rr->request.code = 0x0033; 1292 rr->op = op; 1293 rr->ctrl = ctrl; 1294 rc = chsc(rr); 1295 if (rc) 1296 return -EIO; 1297 rc = (rr->response.code == 0x0001) ? 0 : -EIO; 1298 if (clock_delta) 1299 *clock_delta = rr->clock_delta; 1300 return rc; 1301 } 1302 1303 int chsc_sstpi(void *page, void *result, size_t size) 1304 { 1305 struct { 1306 struct chsc_header request; 1307 unsigned int rsvd0[3]; 1308 struct chsc_header response; 1309 char data[]; 1310 } *rr; 1311 int rc; 1312 1313 memset(page, 0, PAGE_SIZE); 1314 rr = page; 1315 rr->request.length = 0x0010; 1316 rr->request.code = 0x0038; 1317 rc = chsc(rr); 1318 if (rc) 1319 return -EIO; 1320 memcpy(result, &rr->data, size); 1321 return (rr->response.code == 0x0001) ? 0 : -EIO; 1322 } 1323 1324 int chsc_stzi(void *page, void *result, size_t size) 1325 { 1326 struct { 1327 struct chsc_header request; 1328 unsigned int rsvd0[3]; 1329 struct chsc_header response; 1330 char data[]; 1331 } *rr; 1332 int rc; 1333 1334 memset(page, 0, PAGE_SIZE); 1335 rr = page; 1336 rr->request.length = 0x0010; 1337 rr->request.code = 0x003e; 1338 rc = chsc(rr); 1339 if (rc) 1340 return -EIO; 1341 memcpy(result, &rr->data, size); 1342 return (rr->response.code == 0x0001) ? 0 : -EIO; 1343 } 1344 1345 int chsc_siosl(struct subchannel_id schid) 1346 { 1347 struct { 1348 struct chsc_header request; 1349 u32 word1; 1350 struct subchannel_id sid; 1351 u32 word3; 1352 struct chsc_header response; 1353 u32 word[11]; 1354 } *siosl_area; 1355 unsigned long flags; 1356 int ccode; 1357 int rc; 1358 1359 spin_lock_irqsave(&chsc_page_lock, flags); 1360 memset(chsc_page, 0, PAGE_SIZE); 1361 siosl_area = chsc_page; 1362 siosl_area->request.length = 0x0010; 1363 siosl_area->request.code = 0x0046; 1364 siosl_area->word1 = 0x80000000; 1365 siosl_area->sid = schid; 1366 1367 ccode = chsc(siosl_area); 1368 if (ccode > 0) { 1369 if (ccode == 3) 1370 rc = -ENODEV; 1371 else 1372 rc = -EBUSY; 1373 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n", 1374 schid.ssid, schid.sch_no, ccode); 1375 goto out; 1376 } 1377 rc = chsc_error_from_response(siosl_area->response.code); 1378 if (rc) 1379 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n", 1380 schid.ssid, schid.sch_no, 1381 siosl_area->response.code); 1382 else 1383 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n", 1384 schid.ssid, schid.sch_no); 1385 out: 1386 spin_unlock_irqrestore(&chsc_page_lock, flags); 1387 return rc; 1388 } 1389 EXPORT_SYMBOL_GPL(chsc_siosl); 1390 1391 /** 1392 * chsc_scm_info() - store SCM information (SSI) 1393 * @scm_area: request and response block for SSI 1394 * @token: continuation token 1395 * 1396 * Returns 0 on success. 1397 */ 1398 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token) 1399 { 1400 int ccode, ret; 1401 1402 memset(scm_area, 0, sizeof(*scm_area)); 1403 scm_area->request.length = 0x0020; 1404 scm_area->request.code = 0x004C; 1405 scm_area->reqtok = token; 1406 1407 ccode = chsc(scm_area); 1408 if (ccode > 0) { 1409 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1410 goto out; 1411 } 1412 ret = chsc_error_from_response(scm_area->response.code); 1413 if (ret != 0) 1414 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n", 1415 scm_area->response.code); 1416 out: 1417 return ret; 1418 } 1419 EXPORT_SYMBOL_GPL(chsc_scm_info); 1420 1421 /** 1422 * chsc_pnso() - Perform Network-Subchannel Operation 1423 * @schid: id of the subchannel on which PNSO is performed 1424 * @pnso_area: request and response block for the operation 1425 * @oc: Operation Code 1426 * @resume_token: resume token for multiblock response 1427 * @cnc: Boolean change-notification control 1428 * 1429 * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) 1430 * 1431 * Returns 0 on success. 1432 */ 1433 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area, 1434 u8 oc, struct chsc_pnso_resume_token resume_token, int cnc) 1435 { 1436 memset(pnso_area, 0, sizeof(*pnso_area)); 1437 pnso_area->request.length = 0x0030; 1438 pnso_area->request.code = 0x003d; /* network-subchannel operation */ 1439 pnso_area->m = schid.m; 1440 pnso_area->ssid = schid.ssid; 1441 pnso_area->sch = schid.sch_no; 1442 pnso_area->cssid = schid.cssid; 1443 pnso_area->oc = oc; 1444 pnso_area->resume_token = resume_token; 1445 pnso_area->n = (cnc != 0); 1446 if (chsc(pnso_area)) 1447 return -EIO; 1448 return chsc_error_from_response(pnso_area->response.code); 1449 } 1450 1451 int chsc_sgib(u32 origin) 1452 { 1453 struct { 1454 struct chsc_header request; 1455 u16 op; 1456 u8 reserved01[2]; 1457 u8 reserved02:4; 1458 u8 fmt:4; 1459 u8 reserved03[7]; 1460 /* operation data area begin */ 1461 u8 reserved04[4]; 1462 u32 gib_origin; 1463 u8 reserved05[10]; 1464 u8 aix; 1465 u8 reserved06[4029]; 1466 struct chsc_header response; 1467 u8 reserved07[4]; 1468 } *sgib_area; 1469 int ret; 1470 1471 spin_lock_irq(&chsc_page_lock); 1472 memset(chsc_page, 0, PAGE_SIZE); 1473 sgib_area = chsc_page; 1474 sgib_area->request.length = 0x0fe0; 1475 sgib_area->request.code = 0x0021; 1476 sgib_area->op = 0x1; 1477 sgib_area->gib_origin = origin; 1478 1479 ret = chsc(sgib_area); 1480 if (ret == 0) 1481 ret = chsc_error_from_response(sgib_area->response.code); 1482 spin_unlock_irq(&chsc_page_lock); 1483 1484 return ret; 1485 } 1486 EXPORT_SYMBOL_GPL(chsc_sgib); 1487 1488 #define SCUD_REQ_LEN 0x10 /* SCUD request block length */ 1489 #define SCUD_REQ_CMD 0x4b /* SCUD Command Code */ 1490 1491 struct chse_cudb { 1492 u16 flags:8; 1493 u16 chp_valid:8; 1494 u16 cu; 1495 u32 esm_valid:8; 1496 u32:24; 1497 u8 chpid[8]; 1498 u32:32; 1499 u32:32; 1500 u8 esm[8]; 1501 u32 efla[8]; 1502 } __packed; 1503 1504 struct chsc_scud { 1505 struct chsc_header request; 1506 u16:4; 1507 u16 fmt:4; 1508 u16 cssid:8; 1509 u16 first_cu; 1510 u16:16; 1511 u16 last_cu; 1512 u32:32; 1513 struct chsc_header response; 1514 u16:4; 1515 u16 fmt_resp:4; 1516 u32:24; 1517 struct chse_cudb cudb[]; 1518 } __packed; 1519 1520 /** 1521 * chsc_scud() - Store control-unit description. 1522 * @cu: number of the control-unit 1523 * @esm: 8 1-byte endpoint security mode values 1524 * @esm_valid: validity mask for @esm 1525 * 1526 * Interface to retrieve information about the endpoint security 1527 * modes for up to 8 paths of a control unit. 1528 * 1529 * Returns 0 on success. 1530 */ 1531 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid) 1532 { 1533 struct chsc_scud *scud = chsc_page; 1534 int ret; 1535 1536 spin_lock_irq(&chsc_page_lock); 1537 memset(chsc_page, 0, PAGE_SIZE); 1538 scud->request.length = SCUD_REQ_LEN; 1539 scud->request.code = SCUD_REQ_CMD; 1540 scud->fmt = 0; 1541 scud->cssid = 0; 1542 scud->first_cu = cu; 1543 scud->last_cu = cu; 1544 1545 ret = chsc(scud); 1546 if (!ret) 1547 ret = chsc_error_from_response(scud->response.code); 1548 1549 if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0 1550 || !(scud->cudb[0].flags & 0x80) 1551 || scud->cudb[0].cu != cu)) { 1552 1553 CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x " 1554 "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x", 1555 scud->response.code, scud->response.length, 1556 scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu); 1557 ret = -EINVAL; 1558 } 1559 1560 if (ret) 1561 goto out; 1562 1563 memcpy(esm, scud->cudb[0].esm, sizeof(*esm)); 1564 *esm_valid = scud->cudb[0].esm_valid; 1565 out: 1566 spin_unlock_irq(&chsc_page_lock); 1567 return ret; 1568 } 1569 EXPORT_SYMBOL_GPL(chsc_scud); 1570